CN215339505U - Denitrification system ammonia concentration detection device - Google Patents
Denitrification system ammonia concentration detection device Download PDFInfo
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- CN215339505U CN215339505U CN202121725961.0U CN202121725961U CN215339505U CN 215339505 U CN215339505 U CN 215339505U CN 202121725961 U CN202121725961 U CN 202121725961U CN 215339505 U CN215339505 U CN 215339505U
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Abstract
The utility model discloses an ammonia concentration detection device of a denitration system. The utility model comprises a mechanical system and an electronic system, wherein the mechanical system comprises a measuring part, an optical part and a sampling part, and the electronic system comprises a light source part, a signal detection and receiving part and a data processing unit; the measuring part consists of a reference gas chamber and a measuring gas chamber, the measuring gas chamber is used for measuring the gas to be measured in the flue gas, and the reference gas chamber is used for locking the center frequency of a spectral line; one path of laser emitted by the DFB laser enters the reference gas chamber, the laser is received by the first photoelectric detector and then transmits a signal to the industrial personal computer, the other path of laser enters the measurement gas chamber, the laser with characteristic frequency is absorbed by ammonia gas in the measurement gas chamber, the transmitted laser is reflected by the triangular mirror in the triangular mirror chamber and then received by the second photoelectric detector, and the signal is transmitted to the industrial personal computer for data analysis and processing. The utility model has the characteristics of compact structure, reliable equipment, high measurement precision, capability of effectively eliminating dust interference and the like.
Description
Technical Field
The utility model relates to the field of flue gas detection devices, in particular to an ammonia concentration detection device of a denitration system.
Background
At present, nitrogen oxides are one of the components with a high content in atmospheric pollutants. In order to control the emission of nitrogen oxides, a denitration system is installed in a thermal power plant in China, and the Selective Catalytic Reduction (SCR) method has the advantages of high denitration efficiency, mature technology and the like, so that the Selective Catalytic Reduction (SCR) method is widely applied. In the SCR denitration process, the control of ammonia injection amount is crucial, if the ammonia injection amount is too small, the denitration efficiency is too low, so that the ammonia cannot completely catalyze and reduce NOx, the NOx emission amount exceeds the standard, and the environment is polluted. Similarly, if the ammonia spraying amount is too much, the denitration link can not digest the excessive ammonia, and the ammonia is inevitably overflowed. Due to partial SO in the flue gas2Is oxidized into SO3SO when the temperature is lower than 300 DEG C3Can react with escaped ammonia gas to generate ammonium sulfate or ammonium bisulfate, and the ammonium bisulfate has corrosiveness and viscosity. If ammonium bisulfate generates and gathers at the preheater, at first will influence air heater's heating effect, secondly the dust is gathered in a large number at the preheater and is made the preheater to the hindrance effect grow of flue gas, and further aggravation dust is piled up, can only shut down the stove when serious and wash the air heater that takes place the jam. If ammonium bisulfate is generated and accumulated on the catalyst, the catalytic reduction reaction is seriously influenced, the effective utilization of the catalyst is reduced, and the occurrence of ammonia escape is aggravated. A large amount of ammonia escapes into the air, which can cause serious pollution to the atmospheric environment. If the ammonium salt deposits on the surface of downstream equipment and adheres to, and then causes downstream equipment to corrode, not only increases the overhaul cost and the daily maintenance workload, but also possibly causes accidents such as shutdown and the like, so the injection amount of ammonia gas is reasonably controlled, the flue gas denitration efficiency can be improved, the NOx emission is maximally reduced, and the equipment accidents can be reduced. If the escape amount of the ammonia gas can be monitored in real time, real-time reference is provided for ammonia injection, the downstream ammonia escape condition is fed back to the ammonia injection unit, the ammonia injection process is reasonably optimized, and the ammonia injection amount can be maintained at a proper position.
Therefore, the ammonia escape amount is measured on line, the basis can be timely provided for an ammonia gas control system in the SCR, the regulation and control of ammonia gas are optimized, the SCR system uses the least ammonia gas on the premise of high-efficiency denitration, and the ammonia gas escape is reduced.
The existing in-situ measuring devices have the great defect that the problem of large dust of domestic power plants is not considered, so that the laser cannot penetrate through the existing in-situ measuring devices after running for a period of time, and even the laser cannot penetrate through the existing in-situ measuring devices at the initial stage of installation. The measurement optical path is shortened by adopting an oblique-diagonal design scheme to reduce the influence of high dust inside the flue, and although the laser signal can effectively pass through, the measurement of the scheme is not only not representative, but also the transmitting end and the receiving end cannot be aligned at all when the flue is deformed.
The existing sampling type measuring device has the advantages that dust interference does not exist, in the sampling process, smoke components, especially ammonia gas which is trace gas, are changed due to temperature and pressure changes, and meanwhile, the device is complex in equipment, large in occupied space and inconvenient to install.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the existing measuring device, the utility model provides the ammonia concentration measuring device of the denitration system, which adopts a filtering type in-situ sampling measuring scheme, adopts a tunable laser technology as the core of a detecting device, combines a modulation technology and a tunable laser measuring system, and improves the monitoring precision and sensitivity of the gas concentration in the severe environment.
Therefore, the utility model adopts the following technical scheme: a denitration system ammonia concentration detection device comprises a mechanical system and an electronic system, wherein the mechanical system comprises a measuring part, an optical part and a sampling part, and the electronic system comprises a light source part, a signal detection and receiving part and a data processing unit;
the optical part comprises a laser collimator, a first photoelectric detector, a second photoelectric detector and a triangular prism positioned in a triangular prism chamber;
the measuring part consists of a reference gas chamber and a measuring gas chamber, the measuring gas chamber is used for measuring the gas to be measured in the flue gas, and the reference gas chamber is used for locking the center frequency of a spectral line; one path of laser emitted by a DFB laser enters a reference gas chamber, is received by a first photoelectric detector and then transmits a signal to an industrial personal computer, the other path of laser enters a measurement gas chamber, the laser with characteristic frequency is absorbed by ammonia gas in the measurement gas chamber, the transmitted laser is reflected by a triangular mirror in a triangular mirror chamber and then is received by a second photoelectric detector, and the signal is transmitted to the industrial personal computer for data analysis and processing;
the laser frequency measuring device comprises a light source part, a laser controller and a signal generator, wherein the signal generator is used for superposing a low-frequency scanning signal generated by the signal generator and a high-frequency sinusoidal modulation signal generated by a phase-locked amplifier and inputting the superposed signals into the laser controller, the laser controller is used for stably controlling the DFB laser to emit laser required by a measuring part, and meanwhile, the laser controller is used for adjusting related parameters in time according to a feedback signal and locking the laser frequency in real time on line;
the signal detection and receiving part consists of a laser collimator, a second photoelectric detector and a lock-in amplifier, and laser emitted by the DFB laser enters the measurement gas chamber after passing through the laser collimator, is absorbed by gas to be measured in the measurement gas chamber, and is received by the second photoelectric detector after being transmitted;
the data processing unit comprises an industrial personal computer and a display, and is used for analyzing the acquired data and displaying the processed data on the display.
The phase-locked amplifier is an amplifier for measuring weak signals by utilizing the phase-sensitive detection principle, can greatly reduce useless noise, can detect nV-level signals, and inhibits useless signals without frequency characteristics through input signals and special frequency signals.
Further, a flue wall flange sleeve is arranged on the left side of the measuring air chamber and used for stably mounting the mechanical system on the flue wall.
Furthermore, the left end of the measurement air chamber is provided with a photoelectric platform flange sleeve, and the photoelectric platform flange sleeve is used for fixedly placing an optical platform of the laser collimator and the second photoelectric detector.
Furthermore, a vibration damping pad is arranged at the joint of the photoelectric platform flange sleeve and the optical platform flange to slow down vibration transmission.
Furthermore, the right end of the measurement air chamber is provided with a triangular prism chamber, and a graphite gasket is arranged at the tail of the triangular prism, so that the vibration isolation effect is achieved.
Furthermore, the sampling part comprises an exhaust tube arranged above the measuring air chamber and a sampling tube arranged below the measuring air chamber, the exhaust tube is connected with a vacuum pump, and a vacuum valve is arranged on the exhaust tube. And pumping out the gas in the measuring gas chamber by using a vacuum pump, maintaining the negative pressure in the measuring gas chamber, and discharging the pumped gas into the flue again.
Furthermore, the sampling tube is provided with a filtering device to prevent dust from entering the measuring air chamber to pollute the mirror surface.
Furthermore, the filter device is connected with a back-blowing compressed air pipe, compressed air is introduced for back-blowing, and the back-blowing compressed air is controlled by a back-blowing valve; inside the sampling tube, the inner layer of the measuring gas chamber and the filtering device are provided with linings for preventing ammonia from being adsorbed on the surface of the pipeline. The whole device adopts a complete sealing structure except for the air inlet and the air outlet.
Furthermore, the measuring part is provided with a calibration system which is composed of a standard gas bottle filled with standard gas, a mass flowmeter and an electromagnetic valve, and the standard gas bottle, the mass flowmeter and the electromagnetic valve are connected in series by adopting a standard gas pipe.
Furthermore, the back-blowing compressed air pipe and the standard gas pipe are provided with heat tracing devices, so that condensation can be prevented.
The utility model has the following beneficial effects: the utility model belongs to non-contact measurement, does not need to preprocess the flue gas, and has the characteristics of wide measurement range, high response speed, high sensitivity, strong anti-interference capability and the like. Can effectively resist the light intensity change caused by the vibration of the flue wall of the power plant and the dust concentration change, and is suitable for the industrial measurement in severe environment. The response speed is very fast, the response time can reach us magnitude, and the method is far faster than the traditional measuring method, so that online real-time monitoring can be realized, and the method can be used as a feedback signal to optimally control the denitration process. The problem of ammonia gas concentration on-line monitoring exists in the denitration system flue gas is solved. These advantages greatly facilitate its widespread use in the industrial field.
Drawings
FIG. 1 is a schematic structural view of the present invention;
wherein: 1-a signal generator; 2-a laser controller; 3-a phase-locked amplifier; a 4-DFB laser; 5-an industrial personal computer; 6-a display; 7-laser collimator; 8-a reference gas chamber; 9-a first photodetector; 10-a second photodetector; 11-a measuring gas chamber; 12-a triangular prism chamber; 13-a photovoltaic platform; 14-a photovoltaic platform flange sleeve; 15-flue wall flange sleeve; 16-a connecting flange; 17-a heat tracing; 18-a sampling tube; 19-a filtration device; 20-a standard gas cylinder; 21-mass flow meter; 22-a solenoid valve; 23-an air exhaust pipe; 24-a vacuum valve; 25-a vacuum pump; 26-lining; 27-blowback air valve.
Detailed Description
The following description and the accompanying drawings are included to provide a preferred embodiment of the present invention.
The ammonia concentration detection device of the denitration system shown in fig. 1 comprises a mechanical system and an electronic system, wherein the mechanical system consists of a measuring part, an optical part and a sampling part, and the electronic system consists of a light source part, a signal detection and receiving part and a data processing unit.
The optical part consists of a laser collimator 7, a first photoelectric detector 9, a second photoelectric detector 10 and a triangular prism positioned in a triangular prism chamber 12.
The measuring part consists of a reference gas chamber 8 and a measuring gas chamber 11, the measuring gas chamber is used for measuring the gas to be measured in the flue gas, and the reference gas chamber is used for locking the center frequency of a spectral line; one path of laser emitted by the DFB laser 4 enters a reference gas chamber 8, the laser is received by a first photoelectric detector 9 and then is transmitted to an industrial personal computer 5, the other path of laser enters a measurement gas chamber 11, the laser with characteristic frequency is absorbed by ammonia gas in the measurement gas chamber, the transmitted laser is reflected by a triangular mirror in a triangular mirror chamber 12 and then is received by a second photoelectric detector 10, and the signal is transmitted to the industrial personal computer 5 for data analysis and processing.
The left side of the measuring air chamber 11 is provided with a flue wall flange sleeve 15 for stably mounting the mechanical system on the flue wall. The left end of the measurement gas chamber 11 is provided with a photoelectric platform flange sleeve 14, and the photoelectric platform flange sleeve 14 is used for fixedly placing the laser collimator 7 and the optical platform 13 of the second photoelectric detector 10. And a vibration damping pad is arranged at the joint of the photoelectric platform flange sleeve 14 and the optical platform flange to slow down vibration transmission. The right end of the measurement air chamber 11 is provided with a triangular prism chamber 12, and a graphite gasket is arranged at the tail of the triangular prism to play a role in vibration isolation.
The measuring part is provided with a calibration system which is composed of a standard gas bottle 20 filled with standard gas, a mass flowmeter 21 and an electromagnetic valve 22, and the three are connected in series by adopting a standard gas pipe. The standard gas pipe is provided with a heat tracing device 17, the heat tracing device 17 is arranged in the flue wall flange sleeve 15 and is fixed on the outer wall of the measuring gas chamber 11 through a connecting flange 16.
The sampling part comprises an exhaust tube 23 arranged above the measurement air chamber 11 and a sampling tube 18 arranged below the measurement air chamber 11, the exhaust tube 23 is connected with a vacuum pump 25, and a vacuum valve 24 is arranged on the exhaust tube 23. The sampling tube 18 is provided with a filtering device 19 to prevent dust from entering the measuring air chamber and polluting the mirror surface. The filter device 19 is connected with a back-blowing compressed air pipe, compressed air is introduced for back-blowing, and the back-blowing compressed air is controlled by a back-blowing valve 27; the inner side of the sampling tube 18, the inner layer of the measurement air chamber 11 and the filtering device 19 are provided with linings 26 for preventing ammonia from being adsorbed on the surface of the pipeline, and the linings are mainly used for protecting the pipe fitting from being corroded by gas and preventing the surface layer of the pipe fitting from absorbing trace ammonia to influence the measurement. And a heat tracing device 17 is arranged on the blowback compressed air pipe.
The light source part comprises a DFB laser 4, a signal generator 1 and a laser controller 2, the signal generator 1 superposes a low-frequency scanning signal generated by the signal generator 1 and a high-frequency sine modulation signal generated by a phase-locked amplifier 3 and then inputs the superposed signals into the laser controller 2, the laser controller 2 stably controls the DFB laser 4 to emit laser required by a measuring part, and meanwhile, the laser controller 2 timely adjusts related parameters according to a feedback signal and locks laser frequency on line in real time.
The signal detection and receiving part consists of a laser collimator 7, a second photoelectric detector 10 and a lock-in amplifier 3, and when laser emitted by the DFB laser 4 enters the measurement gas chamber 11 after passing through the laser collimator 7 and is absorbed by gas to be measured in the measurement gas chamber, the transmitted laser is received by the second photoelectric detector 10.
The data processing unit consists of an industrial personal computer 5 and a display 6 and is used for analyzing the acquired data and displaying the processed data on the display.
The working process of the utility model is as follows:
the signal generator 1 superposes a low-frequency scanning signal generated by the signal generator and a high-frequency sinusoidal modulation signal generated by the phase-locked amplifier 3 and then inputs the superposed signals into the laser controller 2, and the laser controller 2 stably controls the DFB laser 4 to emit laser frequency required by a measuring part; meanwhile, the laser controller 2 adjusts relevant parameters in time according to the feedback signal, and locks the laser frequency on line in real time. One path of laser emitted by the DFB laser 4 is collimated by the laser collimator 7, enters the measuring gas chamber 11 and is absorbed by gas to be measured in the measuring gas chamber, and transmitted laser is reflected by the triangular mirror and is received and converted into a photoelectric signal by the second photoelectric detector 10 and then enters the industrial personal computer; meanwhile, the other path of laser emitted by the DFB laser 4 enters a reference gas chamber 8, is received by a first photoelectric detector 9 and then is converted into a photoelectric signal to enter an industrial personal computer; the resulting background signal is measured by the reference cell 8, compared to the actual measured cell signal and subtracted. Measuring ammonia gas in the measuring gas chamber, and determining the central frequency of the laser by the reference gas chamber.
The detection process of ammonia gas is as follows: firstly, the DFB laser 4 outputs laser with a certain wavelength, the laser enters a measuring gas chamber to realize linear scanning of ammonia gas, then the laser is collected by a second photoelectric detector 10, converted into an electric signal and amplified by a preamplifier of a detection part, then demodulated by a phase-locked amplifier 3, and the demodulated signal is output, wherein the signal contains relevant information absorbed by the ammonia gas, and the information of the composition and the concentration of the gas in the measuring gas chamber can be obtained after processing. The industrial personal computer 5 analyzes the acquired data, displays the processed data on the display 6 and transmits the processed data to the power plant through the DCS.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (10)
1. The device for detecting the ammonia concentration of the denitration system is characterized by comprising a mechanical system and an electronic system, wherein the mechanical system comprises a measuring part, an optical part and a sampling part, and the electronic system comprises a light source part, a signal detecting and receiving part and a data processing unit;
the optical part comprises a laser collimator (7), a first photoelectric detector (9), a second photoelectric detector (10) and a triangular prism positioned in a triangular prism chamber (12);
the measuring part consists of a reference gas chamber (8) and a measuring gas chamber (11), the measuring gas chamber is used for measuring the gas to be measured in the flue gas, and the reference gas chamber is used for locking the center frequency of a spectral line; one path of laser emitted by a DFB laser (4) enters a reference gas chamber (8), the laser is received by a first photoelectric detector (9) and then transmits a signal to an industrial personal computer (5), the other path of laser enters a measurement gas chamber (11), the laser with characteristic frequency is absorbed by ammonia gas in the measurement gas chamber, the transmitted laser is reflected by a triangular mirror in a triangular mirror chamber (12) and then is received by a second photoelectric detector (10), and the signal is transmitted to the industrial personal computer (5) for data analysis and processing;
the light source part comprises a DFB laser (4), a signal generator (1) and a laser controller (2), wherein the signal generator (1) superposes a low-frequency scanning signal generated by the signal generator and a high-frequency sinusoidal modulation signal generated by a phase-locked amplifier (3) and then inputs the superposed signals into the laser controller (2), the laser controller (2) stably controls the DFB laser (4) to emit laser required by a measuring part, and meanwhile, the laser controller (2) timely adjusts related parameters according to a feedback signal and locks the laser frequency on line in real time;
the signal detection and receiving part consists of a laser collimator (7), a second photoelectric detector (10) and a lock-in amplifier (3), and when laser emitted by the DFB laser (4) passes through the laser collimator (7) and enters a measurement gas chamber (11), the laser is absorbed by gas to be measured in the measurement gas chamber, and the transmitted laser is received by the second photoelectric detector (10);
the data processing unit comprises an industrial personal computer (5) and a display (6) and is used for analyzing the acquired data and displaying the processed data on the display.
2. The ammonia concentration detection device of the denitration system of claim 1, wherein a flue wall flange sleeve (15) is arranged at the left side of the measurement gas chamber (11) and is used for stably mounting a mechanical system on a flue wall.
3. The ammonia gas concentration detection device of the denitration system of claim 1, wherein a photoelectric platform flange sleeve (14) is arranged at the left end of the measurement gas chamber (11), and the photoelectric platform flange sleeve (14) is used for fixing an optical platform (13) for placing the laser collimator (7) and the second photoelectric detector (10).
4. The ammonia gas concentration detection device of the denitration system of claim 3, wherein a vibration damping pad is arranged at the joint of the photoelectric platform flange sleeve (14) and the optical platform flange to damp vibration transmission.
5. The ammonia gas concentration detection device of the denitration system of claim 1, wherein a triangular prism chamber (12) is installed at the right end of the measurement gas chamber (11), and a graphite gasket is placed at the tail of the triangular prism to achieve a vibration isolation effect.
6. The ammonia gas concentration detection device of the denitration system of claim 1, wherein the sampling part comprises an exhaust tube (23) arranged above the measurement gas chamber (11) and a sampling tube (18) arranged below the measurement gas chamber (11), the exhaust tube (23) is connected with a vacuum pump (25), and the exhaust tube (23) is provided with a vacuum valve (24).
7. The ammonia gas concentration detection device of the denitration system of claim 6, wherein the sampling tube (18) is provided with a filtering device (19) for preventing dust from entering the measurement gas chamber and polluting the mirror surface.
8. The ammonia concentration detection device of the denitration system of claim 7, wherein the filter device (19) is connected with a blowback compressed air pipe, compressed air is introduced for blowback, and the blowback compressed air is controlled by a blowback valve (27); the inner side of the sampling tube (18), the inner layer of the measuring air chamber (11) and the filtering device (19) are provided with a lining (26) for preventing ammonia gas from being adsorbed on the surface of the pipeline.
9. The ammonia gas concentration detection device of the denitration system of claim 8, wherein the measurement part is provided with a calibration system, the calibration system is composed of a standard gas bottle (20) filled with standard gas, a mass flow meter (21) and an electromagnetic valve (22), and the three are connected in series by adopting a standard gas pipe.
10. The ammonia concentration detecting device of the denitration system of claim 9, wherein the heat tracing device (17) is arranged on the blowback compressed air pipe and the standard gas pipe.
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| CN202121725961.0U CN215339505U (en) | 2021-07-27 | 2021-07-27 | Denitrification system ammonia concentration detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114993989A (en) * | 2022-07-18 | 2022-09-02 | 中国科学院长春光学精密机械与物理研究所 | Laser gas detection module and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114993989A (en) * | 2022-07-18 | 2022-09-02 | 中国科学院长春光学精密机械与物理研究所 | Laser gas detection module and system |
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